The Legions of the Roman Empire

Foundation:
Likely founded by Caesar in 58 BC for his campaign against the Helvetians. Later reconstituted by Lepidus and Antony in 43 BC.
Its symbol may have been a bull but there is evidence of the thunderbolt.

Foundation:
Founded by Trajan in 105 AD for his war against the Dacians. Named for his family name of Ulpius and numbered XXX because it was the 30th active legion at the time.
Its symbols were Neptune, Jupiter and the capricorn.